Book Image

Mastering JavaScript Functional Programming - Second Edition

By : Federico Kereki
Book Image

Mastering JavaScript Functional Programming - Second Edition

By: Federico Kereki

Overview of this book

Functional programming is a paradigm for developing software with better performance. It helps you write concise and testable code. To help you take your programming skills to the next level, this comprehensive book will assist you in harnessing the capabilities of functional programming with JavaScript and writing highly maintainable and testable web and server apps using functional JavaScript. This second edition is updated and improved to cover features such as transducers, lenses, prisms and various other concepts to help you write efficient programs. By focusing on functional programming, you’ll not only start to write but also to test pure functions, and reduce side effects. The book also specifically allows you to discover techniques for simplifying code and applying recursion for loopless coding. Gradually, you’ll understand how to achieve immutability, implement design patterns, and work with data types for your application, before going on to learn functional reactive programming to handle complex events in your app. Finally, the book will take you through the design patterns that are relevant to functional programming. By the end of this book, you’ll have developed your JavaScript skills and have gained knowledge of the essential functional programming techniques to program effectively.
Table of Contents (17 chapters)
Technical Requirements


In this chapter, we looked at the theory of data types and learned how to use and implement them from a functional point of view. We started with how to define function signatures to help us understand the transformations that are implied by the multiple operations we looked at later. Then, we went on to define several containers, including functors and monads, and saw how they can be used to enhance function composition. Finally, we learned how functions can be directly used by themselves, with no extra baggage, to implement functional data structures to simplify dealing with errors.

In this book, we have looked at several features of functional programming for JavaScript. We started out with some definitions, and a practical example, and then moved on to important considerations such as pure functions, side effects avoidance, immutability, testability, building...